Yea.  I read one news article about it that said that he (the
husband)  pressed her to up the amount on her life insurance and make
him the sole benefit but that she felt something wasn't right so she
lied to him and told she did it when she hadn't.  He apparently
thought she did make the changes but she didn't.

I don't understand why she continued with the chap after that if she
had such suspicions.

There seem to be a few who have preyed on their dive buddy lovers and
killed them.  And some of them weren't diving accidents.